Boring machine



w. P. LOTZ. BORING MACHINE. APPLICATION FILED FEB. 3|192l- Patented July 11, 1922..

3 SHEETSSHEET I.

W. P. LQTZ. BORING MACHINE. APPLICATION FILED ms. 3, 1921.

Patented July 11, 1922.

3 SHEETS-SHEET 2.

r Fri-Fl ITHTT ll TTORIVEVS W. P. LOTZ.

BORING MACHINE. APPLICATION FILED FEB-3.1921.

Patented July 11, 1922 3 SHEETSSHEET 3.

l/VVE/VTOB 4% BK 04/? ATTORNEYS s Hearse.

hairan warren 1?. Lorz, or nnwjeaunswrorr, new JERSEY, assrenoie ro INTERNATIONAL MOTOR COMPANY, or NEW YORK, N. noonrona'rron or DELAWARE.

T 0- aZZ whom it may concern.

Be it known that I, VVnL'rnn 1?. Loan, a

citizen of the United States, residingzin the 3 city of New Brunswick, in the State of New Jersey, have invented certain new and usea This invention relates generally to boring machines and is concerned particularlywithu a fixture for line boring and reaming with a single bar.

through the workmanually and supported rotatably in bushings, one at least of which n has needed to be removed at each operation to permit the withdrawal of the bar end-f wise'with the tools carriedthereon. In relf atively heavy work, as in the boringof cases, "for-gears in the automobile industry two men are required to handle the bar and work, Further, certainty of alinement of holes bored on axes angularly disposed or offset has never been "accomphshed since attereach boring operation either the bar or the work has been changed in its setting and the human factor has entered into the job to such a degree as to prevent absolute tion when the machine is properly indexed.

accuracy. Further, the operations involved ,have been tedious and timeconsuming, the

productionhas been'low and the net expense of bored cases has been much greater than is possiliale' by the improved machine. In addition to speeding up the operations the;

present machine is automatic in a sense in that the boring bars and work are initially set in fixed relation and this relationship maintained until all the work is'completed. Roughing, finishing and reaming vare completed in a 'tloor-tofioo1.' operation.v The machine has'special utility where it is required that holes be bored in a case on axes which are at predetermined a ngularity with respect to one another and wherethe axes oi sets of holes are to be offset at predetermined distances. Inthe improved machine v the work and thebars are supported on a rotatable fixture, which can be indexed in,

any desired position, the bars being eonnectible 'tothe machine spindle for opera- None of theboring bars need to be reinovedfrom their supporting slides or bush- Specification of Letters Patent.

Heretotore, in machines for this purpose the bar has been passed" BORING MACHINE.

Patented July ill, 1922.

Application filed. February I3, 1921. S'erial No. 442,185.

ings until all of the operations of the machine :are completed. The :setting of the parts and manipulations are readily accomi'plEi-shed by a single attendant whose work is carried on quickly-and easily and whose skill plays little part in the accuracy of the operations performed. Another feature of the invention which 'is of importance resides in-the provision of selector mechanism for limiting automatically the travel of the boring and facing tools whereby the same bar with the same tools can be employed where the depth' otlthe cut varies. In this mechanism :'series of stops are carried on a rock [shaft and are movable selectively by the op- Figure 1 is aview in side elevation of the improved fixture with the boring bars removed.

Figure 2 is a view in plan of the fixture shownin Figure 1.

Figure 3 is a view in side elevationof the improved fixture showing the relation of the boring .bars, work and associated parts of the conventional type of boring machine.

Figure l is a view in elevation showing the fixture of Figure 8 indexed through an angle 0 1 909,

Figure 5 is a view in elevation ofthe improved fixture,parts being broken way to show details ofthe work support and the holding dog. p i

Figure 6 .is-a detail view in plan of the work support. 7 i

The embodiment illustrated herein relates to the application of the improved devices to a boring machinehaving a horizontal spindle and adapted to operate on cases for gears to be used in the automobile art. As the description proceeds, however, it will be apparent to the skilled mechanic that the same principles might readily be embodied in a structure applicable to boring machines erating on work of different character.

N-ith this in mind reference is to be had to the table a vof a boring machine on which is clamping elements cl which are releasably engaged with the work, the outline of which appears in dotted lines at c. On the gear case, represented at c, it is proposed to perform several different boring operations while the work is clamped in place on the work support 61, these operations'including the roughing, finishlng and reaming of sets of holes in its side walls on axes, two of which are at-right angles to one another and two of which, while parallel, are offset with respeet to one another. As to each set ofholes, it is proposed to carry on theroughing, finishing and reaming operations successively,

' these operations being also performed simulf 9 maybe clamped; These borlng bars 'taneously in those instances where there are two or more ahned openings through WhlCh the bar extends. Asshown in the drawings,

there are provided twos 'etsof ways f, 9, dis

posed at right anglesto each other and in these ways are slidably mounted slides f, respectively, in which the boring bars f 9? each carry suitable roughing, finishing and-reaming tools, indicated generally at f 9 and may be connected to the revolving spindle 7b of the boring machine it when the fixture c is revolved to index the respective bars in alinement with said spindle, rious stopsand gages are associated with the fixture to guide the attendant in his control of the parts. For instance, Figure 2 shows most plainly a swiveled gage element 2' which is mounted on the fixture at such point as "will indicate the correct position of the work when clamped onthe support (17 One wall of the case to be bored may engage the gage- In like manner it will be seen that the slide 9 has an abutment g which element co-operates with an abutment g in the way 9 to limit the retraction of the slide 7. The slide 7 has a similar abutment i which cooperates with a similar abutment in the way f The inward travel of the slide 9 maybe gaged by an adjustable stop 9 carrie dflthereon and'adapted to co-operate with an abutment mounted in the way 9. For

"the purposes of this specification the case "to be bored has been shown as having 'only one hole in one sidewall to be formed by the bar 9 while two holes in alinment are to be formed by the bar f Since it is pro- 1 posed that the two last named alinedfholes I shau ave the corresponding operations carfried; on simultaneously, the bar I 7. has the various toolsduplicated for association with the respective openings'and an end bearing spindle.

0 is formed on the fixture 0 to receive slidably the end of the bar f and support it in alinement with the slide f.

In so far as the machine has been described, its advantages can be appreciated even without the additional provisions to be hereinafter described. After thework has been clamped on the support d the fixture 0 can be so positioned as to aline one of the bars f g 'with the revolving spindle 71, of the machine it. The spindle and alined bar are connected. During the operation its tools are fed by any approved means until the roughing, finishing andreaming have been completed. The bar is then retracted with its tools, disengaged from the spindle 71 and the fixture c revolved through an angle of 90, or any other predetermined number of degrees, when it isclamped in place with the other bar P, or 9 alined for connection with the spindle in The indexing described may be conveniently accomplished by means of a reciprocabl'e dog m mounted in the fixture c andadapted to engage in the predetermined positions of the fixture openings a formed in the bed a of the machine. This dog may be operated conveniently by means of a spring pressed lever "m' pivoted onthe fixture a and disposed terable relationship. This assures that'the 5 holes willbe bored on all cases on axes which have the same predetermined angularity with respect to one another. It enables the successive operations to be carried on by a single attendant after a very simple indexing manipulation of the fixture and c0nnection of the proper bar with the revolving In some gear cases it is desirable to bore a hole or a set of holes on an axis parallel but offset from the axis of other holes in the case. Provision is made in' the illustrated embodiment of the improved machine for carrying on the necessary boring operations for offset holes with the same facility and accuracy of work as is accomplished where the axes of the holes are angularly disposed.

Referring now to Figure 3 it appears that a third boring bar is .is journaled in .the fixture V0 with 1ts axes substantially parallel to thatof the boring. bar f but displaced with relation therewith; This boring bar may be mounted slidably in a bearing c provided therefor onthe fixture a and rest in: an end 1 ,422,45e gar bearing c which holds the end of the bar with stability against end motion. On the bar are mounted a series of suitable tools indicatec generally at is. The bar 70 may be connected by the attendant to the revolving spindle h of the machine 171, by proper manipulation of the movable head of the machine to bring the spindle in alinement with the bar when the latter is properly presented thereto. From this description it appears clear that the bar is is mounted reciprocably in fixed relation to both of the bars 7, g so that the holes formed in the case by the tools on the bar is will be in exact predetermined relation to all of the holes formed with the first named bars.

To illustrate another feature of the invention whereby the travel of any one tool may be limited automatically, the improved selector mechanism has been illustrated in association with the boring bar 70 although it will be clear that there is no limitation on the support of use of the selector mechanism to be described.

This mechanism has for its general purpose to enable the operator to place any one of several stops in operative relation to the traveling bar so as to arrest the movement of that bar at a predetermined point. This stoppage or control increases the speed of production since it makes it unnecessary for the operator constantly to gage the depth of a cut. The improved selector mechanism is adaptable for limiting the travel of the bar in either direction and this is of particular importance in facing operations wherein the facing tools travel in opposite directions. The embodiment of the selector mechanism shown in the drawings includes a rock shaft Z mounted on the fixture 0 and carrying a handle Z for convenient, adjustment. On this rock shaft are supported a pair of opposed and adjustable stops Z Z and a third stop Z offset angularly with respect to the first named stops and intended for use in limiting a particular cut. On the bar 70 is formed or secured a flange 70 into the path of which either the pair of opposed stops Z Z or the single stop Z may be thrown by rocking the shaft Z. The stop Z limits the travel of the bar I; in one direction since when it is engaged by the flange 7.: the bar can travel no further. Contrariwise, the stop Z limits the extent of travel of the bar 0 in the opposite direction. For special cut the operator may rotate the rock shaft Z until the adjustable stop Z is brought into the path of the flange lo to arrest the movement of the cutting tool at a different point. This selector mechanism may obviously be adapted to different conditions of use and may include any number of stops on the rock shaft Z arranged in various relationships so as to take care of cuts of different depths and kinds.

The general aptitude of the features of the present invention have been indicated hereinbefore and it will be understood that the claims appended hereto while defining the relation of parts in a general way are to be construed with reference to the permissible departures indicated hereinbefore.

I claim as my invention:

1. In a machine for boring or the like, in combination with a power shaft, a revoluble fixture, a work support on the fixture, a plurality of reciprocable cutting tools mounted on the fixture in different horizontal. planes and adapted to move in paths at an angle to each other, and means to index the fixtures for connection of any one of said tools with said power shaft, as selected.

2. In a machine for boring or the like, in combination with a power shaft, a ,revoluble fixture, having undercut ways in angular relation to each other, a work support carried on the fixture, slides mounted in said ways and adapted to support the tool bars and means to index said fixture with one or the other of said bars in position for operative connection to said power shaft.

3. In a boring machine, in combination with a bed and horizontal revolving spindle, a fixture revolubly mounted on the bed, said fixture having radial undercut ways supported in angular relation to one another, a work support on the fixture, slides mounted in said ways and adapted to support boring bars and means to index said fixture with one or the other of said boring bars alined with said spindle for connection thereto.

a. In a boring machine, in combination with a bed and a vertically reciprocable head provided with a rotatable spindle, a revolu ble fixture mounted on the bed, having ways angularly disposed thereon, a work support on the fixture, slides mounted in the ways and supporting borin bars, a bearing on the fixture to support a third boring bar parallel to but offset from one of said first named bars, and means to index the fixture with any one of said bars in alinement with said spindle for connection thereto.

This specification signed this 31st day of January, A. D. 1921.

WALTER P. LOTZ. 

